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AK4554 Arkusz danych(PDF) 9 Page - Asahi Kasei Microsystems

Numer części AK4554
Szczegółowy opis  Low Power & Small Package 16bit ?誇 CODEC
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Producent  AKM [Asahi Kasei Microsystems]
Strona internetowa  http://www.akm.com
Logo AKM - Asahi Kasei Microsystems

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ASAHI KASEI
[AK4554]
MS0325-E-01
2005/08
- 9 -
OPERATION OVERVIEW
System Clock Input
The AK4554 can be input MCLK=256fs, 384fs, 512fs, 768fs or 1024fs (fs is equal to or lower than 25kHz when MCLK
is 1024fs). The input clock applied to the MCLK pin as internal master clock is divided into 256fs automatically. When
MCLK is 1024fs, oversampling rate of D/A converter is automatically changed from 128fs to 256fs. The relationship
between the external clock applied to the MCLK input and the desired sample rate is defined in Table 1. The LRCK clock
input should be synchronized with MCLK. The phase between these clocks does not matter. *fs is sampling frequency.
When the synchronization is out of phase by changing the clock frequencies during normal operation, the AK4554 may
occur click noise.
All external clocks(MCLK, SCLK and LRCK) must be present unless PWADN=PWDAN= “L”. If these clocks are not
provided, the AK4554 may draw excess current and may not possibly operate properly because the device utilizes
dynamic refreshed logic internally.
fs
MCLK
SCLK
256fs
384fs
512fs
768fs
1024fs
32fs
64fs
8.0kHz
2.0480MHz
3.0720MHz
4.0960MHz
6.1440MHz
8.1920MHz
0.2560MHz
0.512MHz
16.0kHz
4.0960MHz
6.1440MHz
8.1920MHz
12.2880MHz
16.3840MHz
0.5120MHz
1.024MHz
32.0kHz
8.1920MHz
12.2880MHz
16.3840MHz
24.5760MHz
N/A
1.0240MHz
2.048MHz
44.1kHz
11.2896MHz
16.9344MHz
22.5792MHz
33.8688MHz
N/A
1.4112MHz
2.822MHz
48.0kHz
12.2880MHz
18.4320MHz
24.5760MHz
36.8640MHz
N/A
1.5360MHz
3.072MHz
Table 1. System Clock Example
For low sampling rates, outband noise causes S/N of DAC to degrade. S/N is improved by setting MCLK to 1024fs. Table
2 shows S/N of DAC output.
fs
MCLK
S/N(fs=8kHz, A-weighted)
8kHz
∼ 50kHz
256fs/384fs/512fs/768fs
84dB
8kHz
∼ 25kHz
1024fs
90dB
Table 2. Relationship among fs, MCLK frequency and S/N of DAC


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